Second line drugs are the TB drugs that are used for the treatment of drug resistant TB. The second line drugs include levofloxacin, moxifloxacin and bedaquiline. There is also pretomanid which is a new second line drug recommended in 2019 for the treatment of drug resistant TB.
All the second line drugs should only be used under the supervision of an experienced doctor. Their use needs to take into account not only the World Health Organisation (WHO) recommendations, but also what is recommended by a country's National Treatment Program.1
Second line drugs - WHO Guidance
Amikacin, a second line injectable drug
In 2019 WHO published new consolidated guidance on the second line drugs to be used for the treatment of drug resistant TB.2 It is said that the updated consolidated guidelines substantially changed the approach to the treatment of MDR-/XDR-TB.3
The updated consolidated guidelines address the role of both the longer and shorter treatment regimens and reclassify the drugs used to compose the longer (18-20 month) regimen into 3 groups (A, B and C) as shown below.4
Second line drugs for treatment of drug resistant TB
| Group A : | Group B : | Group C : |
|---|---|---|
| levofloxacin (Lfx) or moxifloxacin (Mfx) | clofazimine (Cfz) | ethambutol (E) |
| bedaquiline (Bdq) | cycloserine (Cs) or terizidone (Trd) | delamanid (Dlm) |
| linezolid (Lzd) | pyrazinamide (Z) | |
| imipenem-cilastatin (Ipm-Cln) or meropenem (Mpm) | ||
| amikacin (Am) (or stretomycin) (S) |
||
| ethionamide (Eto) or Prothionamide (Pto) | ||
| p-aminosalicylic (PAS) |
WHO now recommends that all oral regimens should become the preferred option for most patients. It is a major step forward in the treatment of patients with drug resistant TB that most patients will no longer be required to have injectable drugs. It is essential that this is implemented as soon as possible because, for some patients injections can be extremely painful and difficult.
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This page was last updated in December 2022.
Author Annabel Kanabus
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Footnotes
- Emanuele Pontali et al, "Regimens to treat multidrug-resistant tuberculosis: past, present and future perspectives", 2019, European Respiratory review, https://err.ersjournals.com/content/28/152/190035#ref-32
- "WHO consolidated guidelines on drug-resistant tuberculosis treatment", 2019, Geneva, https://www.who.int/tb/publications/2019/consolidated-guidelines-drug-resistant-TB-treatment/en/
- Emanuele Pontali et al, "Regimens to treat multidrug-resistant tuberculosis: past, present and future perspectives", 2019, European Respiratory review, https://err.ersjournals.com/content/28/152/190035#ref-32
- Emanuele Pontali et al, "Regimens to treat multidrug-resistant tuberculosis: past, present and future perspectives", 2019, European Respiratory review, https://err.ersjournals.com/content/28/152/190035#ref-32
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Major Source for Second Line Drugs
WHO consolidated guidelines on drug-resistant tuberculosis treatment WHO consolidated guidelines on drug-resistant tuberculosis treatment
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